From 2549ee68e435b77e7e07d3ea95363268cbfe9164 Mon Sep 17 00:00:00 2001
From: HumairAK <humair88@hotmail.com>
Date: Thu, 21 Jul 2016 02:24:24 -0400
Subject: Added other dependencies for authentication, made minor adjustments
 to index.js, added templating for exams, will remove dependencie modules
 later, keep for now

---
 node_modules/express-session/index.js | 637 ++++++++++++++++++++++++++++++++++
 1 file changed, 637 insertions(+)
 create mode 100644 node_modules/express-session/index.js

(limited to 'node_modules/express-session/index.js')

diff --git a/node_modules/express-session/index.js b/node_modules/express-session/index.js
new file mode 100644
index 0000000..5794118
--- /dev/null
+++ b/node_modules/express-session/index.js
@@ -0,0 +1,637 @@
+/*!
+ * express-session
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * Copyright(c) 2014-2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict';
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var cookie = require('cookie');
+var crc = require('crc').crc32;
+var debug = require('debug')('express-session');
+var deprecate = require('depd')('express-session');
+var parseUrl = require('parseurl');
+var uid = require('uid-safe').sync
+  , onHeaders = require('on-headers')
+  , signature = require('cookie-signature')
+
+var Session = require('./session/session')
+  , MemoryStore = require('./session/memory')
+  , Cookie = require('./session/cookie')
+  , Store = require('./session/store')
+
+// environment
+
+var env = process.env.NODE_ENV;
+
+/**
+ * Expose the middleware.
+ */
+
+exports = module.exports = session;
+
+/**
+ * Expose constructors.
+ */
+
+exports.Store = Store;
+exports.Cookie = Cookie;
+exports.Session = Session;
+exports.MemoryStore = MemoryStore;
+
+/**
+ * Warning message for `MemoryStore` usage in production.
+ * @private
+ */
+
+var warning = 'Warning: connect.session() MemoryStore is not\n'
+  + 'designed for a production environment, as it will leak\n'
+  + 'memory, and will not scale past a single process.';
+
+/**
+ * Node.js 0.8+ async implementation.
+ * @private
+ */
+
+/* istanbul ignore next */
+var defer = typeof setImmediate === 'function'
+  ? setImmediate
+  : function(fn){ process.nextTick(fn.bind.apply(fn, arguments)) }
+
+/**
+ * Setup session store with the given `options`.
+ *
+ * @param {Object} [options]
+ * @param {Object} [options.cookie] Options for cookie
+ * @param {Function} [options.genid]
+ * @param {String} [options.name=connect.sid] Session ID cookie name
+ * @param {Boolean} [options.proxy]
+ * @param {Boolean} [options.resave] Resave unmodified sessions back to the store
+ * @param {Boolean} [options.rolling] Enable/disable rolling session expiration
+ * @param {Boolean} [options.saveUninitialized] Save uninitialized sessions to the store
+ * @param {String|Array} [options.secret] Secret for signing session ID
+ * @param {Object} [options.store=MemoryStore] Session store
+ * @param {String} [options.unset]
+ * @return {Function} middleware
+ * @public
+ */
+
+function session(options) {
+  var opts = options || {}
+
+  // get the cookie options
+  var cookieOptions = opts.cookie || {}
+
+  // get the session id generate function
+  var generateId = opts.genid || generateSessionId
+
+  // get the session cookie name
+  var name = opts.name || opts.key || 'connect.sid'
+
+  // get the session store
+  var store = opts.store || new MemoryStore()
+
+  // get the trust proxy setting
+  var trustProxy = opts.proxy
+
+  // get the resave session option
+  var resaveSession = opts.resave;
+
+  // get the rolling session option
+  var rollingSessions = Boolean(opts.rolling)
+
+  // get the save uninitialized session option
+  var saveUninitializedSession = opts.saveUninitialized
+
+  // get the cookie signing secret
+  var secret = opts.secret
+
+  if (typeof generateId !== 'function') {
+    throw new TypeError('genid option must be a function');
+  }
+
+  if (resaveSession === undefined) {
+    deprecate('undefined resave option; provide resave option');
+    resaveSession = true;
+  }
+
+  if (saveUninitializedSession === undefined) {
+    deprecate('undefined saveUninitialized option; provide saveUninitialized option');
+    saveUninitializedSession = true;
+  }
+
+  if (opts.unset && opts.unset !== 'destroy' && opts.unset !== 'keep') {
+    throw new TypeError('unset option must be "destroy" or "keep"');
+  }
+
+  // TODO: switch to "destroy" on next major
+  var unsetDestroy = opts.unset === 'destroy'
+
+  if (Array.isArray(secret) && secret.length === 0) {
+    throw new TypeError('secret option array must contain one or more strings');
+  }
+
+  if (secret && !Array.isArray(secret)) {
+    secret = [secret];
+  }
+
+  if (!secret) {
+    deprecate('req.secret; provide secret option');
+  }
+
+  // notify user that this store is not
+  // meant for a production environment
+  if ('production' == env && store instanceof MemoryStore) {
+    /* istanbul ignore next: not tested */
+    console.warn(warning);
+  }
+
+  // generates the new session
+  store.generate = function(req){
+    req.sessionID = generateId(req);
+    req.session = new Session(req);
+    req.session.cookie = new Cookie(cookieOptions);
+
+    if (cookieOptions.secure === 'auto') {
+      req.session.cookie.secure = issecure(req, trustProxy);
+    }
+  };
+
+  var storeImplementsTouch = typeof store.touch === 'function';
+
+  // register event listeners for the store to track readiness
+  var storeReady = true
+  store.on('disconnect', function ondisconnect() {
+    storeReady = false
+  })
+  store.on('connect', function onconnect() {
+    storeReady = true
+  })
+
+  return function session(req, res, next) {
+    // self-awareness
+    if (req.session) {
+      next()
+      return
+    }
+
+    // Handle connection as if there is no session if
+    // the store has temporarily disconnected etc
+    if (!storeReady) {
+      debug('store is disconnected')
+      next()
+      return
+    }
+
+    // pathname mismatch
+    var originalPath = parseUrl.original(req).pathname;
+    if (originalPath.indexOf(cookieOptions.path || '/') !== 0) return next();
+
+    // ensure a secret is available or bail
+    if (!secret && !req.secret) {
+      next(new Error('secret option required for sessions'));
+      return;
+    }
+
+    // backwards compatibility for signed cookies
+    // req.secret is passed from the cookie parser middleware
+    var secrets = secret || [req.secret];
+
+    var originalHash;
+    var originalId;
+    var savedHash;
+
+    // expose store
+    req.sessionStore = store;
+
+    // get the session ID from the cookie
+    var cookieId = req.sessionID = getcookie(req, name, secrets);
+
+    // set-cookie
+    onHeaders(res, function(){
+      if (!req.session) {
+        debug('no session');
+        return;
+      }
+
+      if (!shouldSetCookie(req)) {
+        return;
+      }
+
+      // only send secure cookies via https
+      if (req.session.cookie.secure && !issecure(req, trustProxy)) {
+        debug('not secured');
+        return;
+      }
+
+      // touch session
+      req.session.touch();
+
+      // set cookie
+      setcookie(res, name, req.sessionID, secrets[0], req.session.cookie.data);
+    });
+
+    // proxy end() to commit the session
+    var _end = res.end;
+    var _write = res.write;
+    var ended = false;
+    res.end = function end(chunk, encoding) {
+      if (ended) {
+        return false;
+      }
+
+      ended = true;
+
+      var ret;
+      var sync = true;
+
+      function writeend() {
+        if (sync) {
+          ret = _end.call(res, chunk, encoding);
+          sync = false;
+          return;
+        }
+
+        _end.call(res);
+      }
+
+      function writetop() {
+        if (!sync) {
+          return ret;
+        }
+
+        if (chunk == null) {
+          ret = true;
+          return ret;
+        }
+
+        var contentLength = Number(res.getHeader('Content-Length'));
+
+        if (!isNaN(contentLength) && contentLength > 0) {
+          // measure chunk
+          chunk = !Buffer.isBuffer(chunk)
+            ? new Buffer(chunk, encoding)
+            : chunk;
+          encoding = undefined;
+
+          if (chunk.length !== 0) {
+            debug('split response');
+            ret = _write.call(res, chunk.slice(0, chunk.length - 1));
+            chunk = chunk.slice(chunk.length - 1, chunk.length);
+            return ret;
+          }
+        }
+
+        ret = _write.call(res, chunk, encoding);
+        sync = false;
+
+        return ret;
+      }
+
+      if (shouldDestroy(req)) {
+        // destroy session
+        debug('destroying');
+        store.destroy(req.sessionID, function ondestroy(err) {
+          if (err) {
+            defer(next, err);
+          }
+
+          debug('destroyed');
+          writeend();
+        });
+
+        return writetop();
+      }
+
+      // no session to save
+      if (!req.session) {
+        debug('no session');
+        return _end.call(res, chunk, encoding);
+      }
+
+      if (shouldSave(req)) {
+        req.session.save(function onsave(err) {
+          if (err) {
+            defer(next, err);
+          }
+
+          writeend();
+        });
+
+        return writetop();
+      } else if (storeImplementsTouch && shouldTouch(req)) {
+        // store implements touch method
+        debug('touching');
+        store.touch(req.sessionID, req.session, function ontouch(err) {
+          if (err) {
+            defer(next, err);
+          }
+
+          debug('touched');
+          writeend();
+        });
+
+        return writetop();
+      }
+
+      return _end.call(res, chunk, encoding);
+    };
+
+    // generate the session
+    function generate() {
+      store.generate(req);
+      originalId = req.sessionID;
+      originalHash = hash(req.session);
+      wrapmethods(req.session);
+    }
+
+    // wrap session methods
+    function wrapmethods(sess) {
+      var _save = sess.save;
+
+      function save() {
+        debug('saving %s', this.id);
+        savedHash = hash(this);
+        _save.apply(this, arguments);
+      }
+
+      Object.defineProperty(sess, 'save', {
+        configurable: true,
+        enumerable: false,
+        value: save,
+        writable: true
+      });
+    }
+
+    // check if session has been modified
+    function isModified(sess) {
+      return originalId !== sess.id || originalHash !== hash(sess);
+    }
+
+    // check if session has been saved
+    function isSaved(sess) {
+      return originalId === sess.id && savedHash === hash(sess);
+    }
+
+    // determine if session should be destroyed
+    function shouldDestroy(req) {
+      return req.sessionID && unsetDestroy && req.session == null;
+    }
+
+    // determine if session should be saved to store
+    function shouldSave(req) {
+      // cannot set cookie without a session ID
+      if (typeof req.sessionID !== 'string') {
+        debug('session ignored because of bogus req.sessionID %o', req.sessionID);
+        return false;
+      }
+
+      return !saveUninitializedSession && cookieId !== req.sessionID
+        ? isModified(req.session)
+        : !isSaved(req.session)
+    }
+
+    // determine if session should be touched
+    function shouldTouch(req) {
+      // cannot set cookie without a session ID
+      if (typeof req.sessionID !== 'string') {
+        debug('session ignored because of bogus req.sessionID %o', req.sessionID);
+        return false;
+      }
+
+      return cookieId === req.sessionID && !shouldSave(req);
+    }
+
+    // determine if cookie should be set on response
+    function shouldSetCookie(req) {
+      // cannot set cookie without a session ID
+      if (typeof req.sessionID !== 'string') {
+        return false;
+      }
+
+      return cookieId != req.sessionID
+        ? saveUninitializedSession || isModified(req.session)
+        : rollingSessions || req.session.cookie.expires != null && isModified(req.session);
+    }
+
+    // generate a session if the browser doesn't send a sessionID
+    if (!req.sessionID) {
+      debug('no SID sent, generating session');
+      generate();
+      next();
+      return;
+    }
+
+    // generate the session object
+    debug('fetching %s', req.sessionID);
+    store.get(req.sessionID, function(err, sess){
+      // error handling
+      if (err) {
+        debug('error %j', err);
+
+        if (err.code !== 'ENOENT') {
+          next(err);
+          return;
+        }
+
+        generate();
+      // no session
+      } else if (!sess) {
+        debug('no session found');
+        generate();
+      // populate req.session
+      } else {
+        debug('session found');
+        store.createSession(req, sess);
+        originalId = req.sessionID;
+        originalHash = hash(sess);
+
+        if (!resaveSession) {
+          savedHash = originalHash
+        }
+
+        wrapmethods(req.session);
+      }
+
+      next();
+    });
+  };
+};
+
+/**
+ * Generate a session ID for a new session.
+ *
+ * @return {String}
+ * @private
+ */
+
+function generateSessionId(sess) {
+  return uid(24);
+}
+
+/**
+ * Get the session ID cookie from request.
+ *
+ * @return {string}
+ * @private
+ */
+
+function getcookie(req, name, secrets) {
+  var header = req.headers.cookie;
+  var raw;
+  var val;
+
+  // read from cookie header
+  if (header) {
+    var cookies = cookie.parse(header);
+
+    raw = cookies[name];
+
+    if (raw) {
+      if (raw.substr(0, 2) === 's:') {
+        val = unsigncookie(raw.slice(2), secrets);
+
+        if (val === false) {
+          debug('cookie signature invalid');
+          val = undefined;
+        }
+      } else {
+        debug('cookie unsigned')
+      }
+    }
+  }
+
+  // back-compat read from cookieParser() signedCookies data
+  if (!val && req.signedCookies) {
+    val = req.signedCookies[name];
+
+    if (val) {
+      deprecate('cookie should be available in req.headers.cookie');
+    }
+  }
+
+  // back-compat read from cookieParser() cookies data
+  if (!val && req.cookies) {
+    raw = req.cookies[name];
+
+    if (raw) {
+      if (raw.substr(0, 2) === 's:') {
+        val = unsigncookie(raw.slice(2), secrets);
+
+        if (val) {
+          deprecate('cookie should be available in req.headers.cookie');
+        }
+
+        if (val === false) {
+          debug('cookie signature invalid');
+          val = undefined;
+        }
+      } else {
+        debug('cookie unsigned')
+      }
+    }
+  }
+
+  return val;
+}
+
+/**
+ * Hash the given `sess` object omitting changes to `.cookie`.
+ *
+ * @param {Object} sess
+ * @return {String}
+ * @private
+ */
+
+function hash(sess) {
+  return crc(JSON.stringify(sess, function (key, val) {
+    if (key !== 'cookie') {
+      return val;
+    }
+  }));
+}
+
+/**
+ * Determine if request is secure.
+ *
+ * @param {Object} req
+ * @param {Boolean} [trustProxy]
+ * @return {Boolean}
+ * @private
+ */
+
+function issecure(req, trustProxy) {
+  // socket is https server
+  if (req.connection && req.connection.encrypted) {
+    return true;
+  }
+
+  // do not trust proxy
+  if (trustProxy === false) {
+    return false;
+  }
+
+  // no explicit trust; try req.secure from express
+  if (trustProxy !== true) {
+    var secure = req.secure;
+    return typeof secure === 'boolean'
+      ? secure
+      : false;
+  }
+
+  // read the proto from x-forwarded-proto header
+  var header = req.headers['x-forwarded-proto'] || '';
+  var index = header.indexOf(',');
+  var proto = index !== -1
+    ? header.substr(0, index).toLowerCase().trim()
+    : header.toLowerCase().trim()
+
+  return proto === 'https';
+}
+
+/**
+ * Set cookie on response.
+ *
+ * @private
+ */
+
+function setcookie(res, name, val, secret, options) {
+  var signed = 's:' + signature.sign(val, secret);
+  var data = cookie.serialize(name, signed, options);
+
+  debug('set-cookie %s', data);
+
+  var prev = res.getHeader('set-cookie') || [];
+  var header = Array.isArray(prev) ? prev.concat(data)
+    : Array.isArray(data) ? [prev].concat(data)
+    : [prev, data];
+
+  res.setHeader('set-cookie', header)
+}
+
+/**
+ * Verify and decode the given `val` with `secrets`.
+ *
+ * @param {String} val
+ * @param {Array} secrets
+ * @returns {String|Boolean}
+ * @private
+ */
+function unsigncookie(val, secrets) {
+  for (var i = 0; i < secrets.length; i++) {
+    var result = signature.unsign(val, secrets[i]);
+
+    if (result !== false) {
+      return result;
+    }
+  }
+
+  return false;
+}
-- 
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